风电场多功能储能电站功率分配策略

Power Distribution Strategy of Multi-functional Energy Storage Power Station in Wind Farm

随着新能源装机比例的增加,新能源场站调频调压等调节能力日益受到重视。针对配置储能的新能源场站一次调频、功率平滑以及调压协调控制问题,利用聚类算法得到储能平抑波动功率需求,设定风储各自调频备用功率以及储能电站调压备用功率;其次,利用储能剩余有功功率与荷电状态(SOC)修正储能一次调频有功出力;之后,基于储能无功裕度以及电压偏差紧急程度对储能无功-电压下垂系数进行修正;最后,以优先保证调频效果为目标,提出储能平抑波动、一次调频和调压的储能多功能协调运行策略。基于Matlab/Simulink进行仿真验证,对储能平抑波动与一次调频、储能平抑波动与调压以及3种功能协调运行分别进行了仿真工况分析,结果表明,所提多功能协调运行策略可在储能平抑风电波动工况下促进电网频率、电压以及SOC恢复。

With the increase in the proportion of new energy installed capacity,the modulation capacity of new energy stations such as frequency modulation and voltage modulation has been paid more and more attention.In view of the problems of primary frequency modulation,power smoothing,and coordinated control of voltage modulation for new energy stations equipped with energy storage,this paper used a clustering algorithm to obtain the energy storage to suppress fluctuating power requirements and set the standby power of frequency modulation for wind storage and voltage modulation for energy storage stations.Secondly,the residual active power for energy storage and the state of charge(SOC)were used to correct the active power of primary frequency modulation for energy storage.Then,based on the reactive power margin for energy storage and the emergency degree of voltage deviation,the reactive power-voltage sag coefficient was modified.Finally,to ensure the frequency modulation effect,the multifunction coordinated operation strategy of energy storage was proposed,involving fluctuation suppression by energy storage,primary frequency modulation,and voltage modulation.Based on Matlab/Simulink,simulation verification was carried out,and the simulation conditions of fluctuation suppression by energy storage and primary frequency modulation,fluctuation suppression by energy storage and voltage modulation,as well as the coordinated operation of the three functions were analyzed,respectively.The results show that the multi-function coordinated operation strategy proposed in this paper can promote the grid frequency,voltage,and SOC recovery under the condition of fluctuation suppression of wind power by energy storage.